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Romans-sur-Isère, Auvergne-Rhône-Alpes climate

Cfa Humid subtropical

Romans-sur-Isère has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 86°F, while the coldest is January averaging around 37°F at night. Around 36 inches of precipitation falls each year, peaking in October (5.2 inches) and easing off in February (1.7 inches).

☀️ Summers

Warm

Highs near 86°F in July.

About 25 days a year above 90 °F

❄️ Winters

Chilly

Lows near 37°F in January.

About 27 freezing nights a year

🌧️ Rain

Moderate rainfall

About 36 in of rain a year.

Wettest in October

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+1.6 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Romans-sur-Isère climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	48	51	59	65	72	80	86	85	76	66	55	48
Avg temp (°F)	42	44	50	56	63	70	75	74	66	59	49	43
Avg low (°F)	37	37	42	46	53	60	64	63	57	51	43	38
Precipitation (in)	2.7	1.7	1.9	2.9	3.1	2.2	2.2	2.2	4.6	5.2	5.1	2.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	48	51	59	65	72	80
Avg temp (°F)	42	44	50	56	63	70
Avg low (°F)	37	37	42	46	53	60
Precipitation (in)	2.7	1.7	1.9	2.9	3.1	2.2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	86	85	76	66	55	48
Avg temp (°F)	75	74	66	59	49	43
Avg low (°F)	64	63	57	51	43	38
Precipitation (in)	2.2	2.2	4.6	5.2	5.1	2.4

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	9	9	11	11	8	7	7	9	14	13	11
Days with high ≥ 90°F (days)	—	—	—	—	0.2	4	11	10	1	—	—	—
Days with low ≤ 32°F (days)	8	8	2	0.1	—	—	—	—	—	0.1	2	6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	10	9	9	11	11	8
Days with high ≥ 90°F (days)	—	—	—	—	0.2	4
Days with low ≤ 32°F (days)	8	8	2	0.1	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	7	7	9	14	13	11
Days with high ≥ 90°F (days)	11	10	1	—	—	—
Days with low ≤ 32°F (days)	—	—	—	0.1	2	6

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	62	59	58	61	61	52	43	45	50	62	64	62
Clear days (≤ 30% cloud)	6	6	8	7	6	8	12	11	10	6	5	5
Partly cloudy days (30–70%)	12	11	11	9	10	12	13	12	10	10	11	12
Cloudy days (≥ 70%)	14	11	13	14	14	9	6	8	10	15	15	14
Relative humidity (%)	86	82	78	74	71	64	55	55	66	78	85	87
Wind speed (mph)	6.5	7.0	6.9	6.9	6.4	6.3	6.4	6.0	6.0	6.1	6.6	6.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	62	59	58	61	61	52
Clear days (≤ 30% cloud)	6	6	8	7	6	8
Partly cloudy days (30–70%)	12	11	11	9	10	12
Cloudy days (≥ 70%)	14	11	13	14	14	9
Relative humidity (%)	86	82	78	74	71	64
Wind speed (mph)	6.5	7.0	6.9	6.9	6.4	6.3

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	43	45	50	62	64	62
Clear days (≤ 30% cloud)	12	11	10	6	5	5
Partly cloudy days (30–70%)	13	12	10	10	11	12
Cloudy days (≥ 70%)	6	8	10	15	15	14
Relative humidity (%)	55	55	66	78	85	87
Wind speed (mph)	6.4	6.0	6.0	6.1	6.6	6.4

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Montelimar, a weather station, about 58 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →